Figure 4. Comparison of trends in the age and sex distribution of persons with Lyme disease in MarketScan with US surveillance, 2005–2010. Incidence is per 100,000 persons. Age distribution of persons with Lyme disease in MarketScan did not differ from those reported through US surveillance (male patients: χ2 test, p = 0.57; female patients: χ2 test, p = 0.43). *US 2010 Census population estimates were used as the denominator for surveillance incidence calculations.